US Bridges

Interhaven Avenue over Stony Brook

Fair

Somerset County, New Jersey · At Somerset ST Intersect. · Structure no. 18M1022

Built
1976
49 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
61 ft
1 main span
Daily traffic
1,925
2023 count
Owner
County
County Highway Agency

About this bridge

Interhaven Avenue over Stony Brook is a prestressed concrete box beam or girders - multiple carrying Interhaven Avenue over Stony Brook in Somerset County, New Jersey. It was built in 1976, so it is 49 years old, younger than the New Jersey average of 58.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,925 vehicles a day, roughly 1% of them trucks, projected to reach 2,349 by 2043. The structure is 61 ft (18.6 m) long and 39 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesInterhaven Avenue
CrossesStony Brook
LocationAt Somerset ST Intersect.
RouteCity Street 0
CountySomerset County
StateNew Jersey
Coordinates40.62905, -74.44186
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length61 ft (18.6 m)
Longest span58 ft (17.7 m)
Deck width39 ft (11.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,925 (2023)
Projected traffic2,349 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Interhaven Avenue over Stony Brook built?

It was built in 1976, making it 49 years old in 2025.

What condition is Interhaven Avenue over Stony Brook in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.

How much traffic does Interhaven Avenue over Stony Brook carry?

About 1,925 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Interhaven Avenue over Stony Brook?

The structure is 61 ft (18.6 m) long with a longest span of 58 ft (17.7 m) and a deck 39 ft wide.

Who owns Interhaven Avenue over Stony Brook?

It is owned by the County Highway Agency.